Preparation and use of iron magnetic pigments

Details Preparation and use of iron magnetic pigments Preparation and use of iron magnetic pigments

1985-05-31

1986-12-23

Morris, Theodore

Compositions: coating or plastic

Materials or ingredients

Miscellaneous

252 6256, C04B 1400, C04B 3526, C01G 4908

Patent

active

046310908

ABSTRACT:
A magnetic pigment consisting essentially of iron, having an X-ray crystallite size with the 110 reflex of from 14 to 22 nm, a coercive force from 55 to 88 kA/m and a switching field distribution of the oriented pigment particles of less than 0.55 is produced by precipitating an iron (II)-salt with a super-stoichiometric quantity of an aqueous alkali metal carbonate solution and oxidizing it to produce .alpha.-FeOOH, .gamma.-Fe.sub.2 O.sub.3, Fe.sub.3 O.sub.4 or betholoid iron oxides, subsequently reducing it to the metal, and providing the iron oxides or oxide hydroxides with an inorganic protection from sintering at the latest during reduction.

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